A set of panels including a first panel with a first main plane and a second panel with a second main plane. The first and the second panel are provided with a mechanical locking device for locking a first edge of the first panel to a second edge of the second panel at a junction plane, wherein the first main plane is essentially perpendicular to the second main plane and the junction plane is extending between the first main plane and the second main plane. The first edge includes an edge tongue that extends from the junction plane. The second edge includes an edge groove at the junction plane. The edge tongue is configured to cooperate with the edge groove for locking together the first and the second edges in a first direction which is perpendicular to the first main plane. The edge tongue includes a tongue groove.

A composed element, such as a piece of furniture, wherein the composed element comprises at least a rear wall, as well as a number of constructional parts forming a whole in which the rear wall has to be provided. The rear wall forms the rear side of the composed element and includes one or more rear wall parts. The composed element comprises seats for installing at least one of the rear wall parts, which are configured such that the rear wall part can be slid into the seats starting from the rear side of the composed element from a position differing from the final plane in which the rear wall part will be situated in the final condition.

Composed element, with at least two wood-based panel-shaped elements; wherein said panel-shaped elements can be coupled to each other at an angle and with a miter joint by means of a locking tongue and groove connection; wherein the tongue consists of a split tongue, with thus at least a first tongue portion and a second tongue portion, as well as a slit situated there between; characterized in that said slit, seen in cross-section, globally extends according to a direction which deviates from the direction of the center line of the panel-shaped element on which the tongue is provided.

A set of panels including a first panel with a first main plane and a second panel with a second main plane. A first edge of the first panel is configured to be locked to a second edge of the second panel, wherein the first main plane is essentially perpendicular to the second main plane, and wherein the first and the second edges are locked in a first direction, which is perpendicular to the first main plane, and a second direction, which is perpendicular to the second main plane. The first edge includes an edge tongue, with a longitudinal direction along the first edge, including a bottom edge, a first surface and an opposite second surface. The edge groove and/or the edge tongue is/are configured such that a greater force is absorbed by the longitudinal central part than by an edge part at third and fourth edges.

A system for fastening a first wooden member to a second wooden member includes a tenon configured to couple to the first wooden member such that the tenon extends from the first wooden member. The tenon has a first hole, a second hole, and a third hole. A first fastener extends through the first hole of the tenon and secures the tenon to the first wooden member. A second fastener extends through the second hole of the tenon and secures the tenon to the first wooden member. A third fastener extends through the second wooden member and is received into the third hole of the tenon to thereby secure the first wooden member to the second wooden member. The third fastener can be removed to thereby disconnect the first wooden member from the second wooden member repeatedly without aesthetic damage or loss of structural integrity.

A composed element, such as a piece of furniture, wherein the composed element comprises at least a rear wall, as well as a number of constructional parts forming a whole in which the rear wall has to be provided. The rear wall forms the rear side of the composed element and includes one or more rear wall parts. The composed element comprises seats for installing at least one of the rear wall parts, which are configured such that the rear wall part can be slid into the seats starting from the rear side of the composed element from a position differing from the final plane in which the rear wall part will be situated in the final condition.

A set of panels including a first panel with a first main plane and a second panel with a second main plane. The first and the second panel are provided with a mechanical locking device for locking a first edge of the first panel to a second edge of the second panel at a junction plane, wherein the first main plane is essentially perpendicular to the second main plane and the junction plane is extending between the first main plane and the second main plane. The first edge includes an edge tongue that extends from the junction plane. The second edge includes an edge groove at the junction plane. The edge tongue is configured to cooperate with the edge groove for locking together the first and the second edges in a first direction which is perpendicular to the first main plane. The edge tongue includes a tongue groove.

A set of panels including a first panel with a first main plane and a second panel with a second main plane. A first edge of the first panel is configured to be locked to a second edge of the second panel, wherein the first main plane is essentially perpendicular to the second main plane, and wherein the first and the second edges are locked in a first direction, which is perpendicular to the first main plane, and a second direction, which is perpendicular to the second main plane. The first edge includes an edge tongue, with a longitudinal direction along the first edge, including a bottom edge, a first surface and an opposite second surface. The edge groove and/or the edge tongue is/are configured such that a greater force is absorbed by the longitudinal central part than by an edge part at third and fourth edges.

Composed element, with at least two wood-based panel-shaped elements; wherein said panel-shaped elements can be coupled to each other at an angle and with a miter joint by means of a locking tongue and groove connection; wherein the tongue consists of a split tongue, with thus at least a first tongue portion and a second tongue portion, as well as a slit situated there between; characterized in that said slit, seen in cross-section, globally extends according to a direction which deviates from the direction of the center line of the panel-shaped element on which the tongue is provided.

An assembled product includes at least three elements arranged in three different planes. A first element is connected perpendicular to a second element, and a third element is connected perpendicular to the second element. The assembled product includes one or more locking devices, each comprising a flexible tongue arranged in an insertion groove one of the at least three elements. The flexible tongue cooperates with a tongue groove, at an adjacent one of the at least three elements, for locking the one element and the adjacent element together. A second edge of the second element is connected to a second edge of the third element by a first of said locking devices.